D And F Block Elements

Among the following transition metal ions, how many have the same number of unpaired electrons, and thus approximately the same magnetic moment?

(i) $\mathrm{Cr}^{3+}$

(ii) $\mathrm{Fe}^{3+}$

(iii) $\mathrm{Mn}^{2+}$

(iv) $\mathrm{Co}^{2+}$

(v) $\mathrm{Ni}^{2+}$